package net.sf.hibernate.examples.quickstart;

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.examples.HibernateUtil;

public class Delegate {
   public String test() throws HibernateException {
      Session session = HibernateUtil.currentSession();
      session.close();
      return "Hibernate session opened and closed successfully";
   }
   public static void main(String[] args) throws HibernateException {
      Delegate d = new Delegate();
      System.out.print(d.test());
   }
}

package net.sf.hibernate.examples;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;

//import org.apache.commons.logging.Log;
//import org.apache.commons.logging.LogFactory;

public class HibernateUtil {

    //private static Log log = LogFactory.getLog(HibernateUtil.class);

    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            //log.error("Initial SessionFactory creation failed.", ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static final ThreadLocal session = new ThreadLocal();

    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this Thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            session.set(s);
        }
        return s;
    }

    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        session.set(null);
        if (s != null)
            s.close();
    }
}